My doctrine manager registry

DoctrineManagerRegistry.php

<?php                                                                                           

namespace Childcare\Common;

use Doctrine\Common\Persistence\AbstractManagerRegistry;
use Doctrine\ORM\ORMException;
use Pimple;

class DoctrineManagerRegistry extends AbstractManagerRegistry
{
    protected $container;

    protected function getService($name)
    {
        return $this->container[$name];
    }

    protected function resetService($name)
    {
        $this->container[$name] = null;
    }

    public function setContainer(Pimple $container = null)
    {
        $this->container = $container;
    }

    public function getAliasNamespace($alias)
    {
        foreach (array_keys($this->getManagers()) as $name) {
            try {
                return $this->getManager($name)->getConfiguration()->getEntityNamespace($alias);
            } catch (ORMException $e) {
            }
        }

        throw ORMException::unknownEntityNamespace($alias);
    }
}